...so when I read the book I assumed Frodo and Sam splitting up was in the book. I was surprised it wasn't in there, but it did flow better with the way Tolkien wrote it.

But for the film, I can't imagine it NOT being included. Gollum spends the entire first half of ROTK trying to split them up... it's his one victory, and it creates the perfect moment when Sam returns to save Frodo from being eaten by Shelob.

Wouldn't change a thing about the Minas Tirith scene either. Gandalf laughing gets me misty eyed every time. The Grey Pilgrim, they once called me. Three hundred lives of men I walked this earth, and now I have no time...